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PubMed1991

[Complete removable dentures and prognathism].

Further to some reminders concerning terminology and resorption, this article presents the full denture prosthetic treatment for two patients with total edentation and a prognathic malocclusion. The first case presents a tridimensional symptomatology, described by: a progeny; a voluminous mandibular terrain; a concave profile; a rather closed mandibular angle; a mandible ridge which circumscribes the upper jaw; The particularities of the prosthetic treatment in this case are: a lowering of the posterior occlusal plane; a mounting of the teeth in a limited external position, that is to say, the maxillary lingual cuspids and the mandibular mesio-distal groove on the inter-crest line; the mandibular incisors and cuspids placed with a lingual inclination to obtain an edge-to-edge occlusal contact. The second case is of vertical symptomatology type, described by: a macrogeny; a moderate concavity of the profile; a very marked increase of the vertical dimension; an open mandibular angle; a short ramus; a long mandibule; a very marked overjet between the anterior crests. The particularities of the prosthetic treatment for this case are: a posterior teeth placement, avoiding cross-bite position, taken into account the strong convergence of the intercrest lines; a strong lingual inclination of the mandibular incisors and cuspids, in order to obtain an edge-to-edge occlusal contact. In the light of these two specific cases, emphasis is placed on the particularities of the treatment and on the teeth placement proposed in order to avoid any cross-bite teeth mounting.

Adult↗
PubMed1990

Evaluation of soft tissue profile following intraoral ramus osteotomy in Chinese adults with mandibular prognathism.

Twenty-five Chinese adults with mandibular prognathism were treated with either the intraoral vertical subcondylar osteotomy or the bilateral sagittal split ramus osteotomy. The patients were kept in maxillomandibular fixation for 6 to 8 weeks while osteosynthesis was achieved with the use of intraosseous wiring. Serial lateral cephalograms were taken presurgery and between 12 and 26 months postsurgery, and specific soft and hard tissue points were digitized on a computer. The mean mandibular setback postsurgically was 8.4 +/- 3.2 mm, with a 5.2-degree reduction in point A-nasion-point B angle. Posterior movement of pogonion, point B and the mandibular incisal edge was accompanied by posterior movement of 95% at soft tissue pogonion (r = .96), 89% at soft tissue point B (r = .83), and 67% at labrale inferius (r = .81), respectively. The correlation between changes in the labrale superius and mandibular setback appeared to be dependent on both the amount of mandibular setback and the degree of mandibular rotation during the setback surgery. The presently reported ratios of the soft tissue response to hard tissue movement vary from those reported in white patients by other researchers, which confirms the need for different ratios for different racial types.

Adult↗
PubMedDate not supplied

[Combined Le-Fort I and sagittal split osteotomy of the mandible for severe mandibular prognathism or maxillary retrognathism. Follow-up study].

11 patients were treated for severe mandibular prognathism or maxillary retrognathism with a one-stage procedure combining Le-Fort I and sagittal-split osteotomy of the ramus. Clinical and radiographic check-ups were done at 3, 6, 12 and 18 months after the operation. The evaluation was based on the measured base angles and distances between the planes passing through skeletal key positions of the visceral cranium and the resulting soft tissue positions. The esthetic and functional rehabilitation obtained was good. In 3 of our patients the skeletal relapse rate was 1.1 mm.

Adult↗
PubMedDate not supplied

[The rationale for the choice of the method of surgical intervention in patients with mandibular prognathism].

Topographic and anatomic structures of the facial bones and functional disorders related to this structures were examined in patients with prognathism. The obtained data were used to define indications for and rational methods of surgical treatment of the condition. Methods of surgical intervention with transverse, longitudinal, and planar osteotomy of the mandibular branches are suggested with consideration for the form and severity of the disease. Reduced bioelectrical activity of the masticatory muscles proper and the presence of obstructive ventilatory defect due to impaired patency of the upper respiratory route were detected.

Adolescent↗
PubMed1989

[Study on the changes in the upper airway following osteotomy for the mandibular prognathism].

This study was designed to compare pre-operation, immediate post-operation and over 6 month's follow-up for the mandibular prognathism in order to investigate the changes in the upper airway following mandibular osteotomy. The subjects were 18 patients. Their lateral cephalograms were taken pre-operatively, immediate post-operatively and over 6 months after operation and traced and analysed based on 10 selected items. The following conclusions were reached. 1) The downward displacement of the hyoid bone was recognized right after operation. (P less than 0.01) The hyoid bone tended to move to the original position in male group but not in female group. (P less than 0.01, P greater than 0.05) 2) The distance between the body of hyoid and posterior pharyngeal wall remained constant postoperatively (P greater than 0.05) 3) The distance between the body of hyoid and Menton was found to be shortened right after operation and remained constant thereafter. (P less than 0.01, P greater than 0.05) 4) The distance between the palate and the dorsum of tongue remained constant postoperatively. (P greater than 0.05) 5) The distance between the root of tongue and posterior pharyngeal wall was found to be shortened right after operation and remained constant thereafter. (P less than 0.01, P greater than 0.05) 6) APDI, SN-Pog, SNB and ANB remained constant during over 6 month's follow-up. (P greater than 0.05) 7) Relapse was found to show no correlation to other measurements.

Airway Obstruction↗
PubMed1989

[Postoperative evaluation of mandibular prognathism corrected by sagittal splitting osteotomy].

The purpose of this study is to examine short-term postoperative stability of mandibular prognathism subjected to the surgical-orthodontic treatment. Eight skeletal Class III patients (7 females and 1 male) corrected by sagittal splitting ramus osteotomy after preoperative orthodontic treatment. The stable occlusions at six months after the orthognathic surgery were evaluated. Cephalometric radiographs and cephalometric laminagraphs were used as materials. The results were as follows: 1) Surgical changes: Pogonion was repositioned by 9.8 mm in an average. Overjet was increased of 9.1 mm in an average. Condyles were displaced antero-inferiorly in 3 cases. 2) Changes during intermaxillary fixation: Antero-superior rotation of the proximal segments were found. Region of chin moved inferiorly. Upper and lower incisors were inclined lingually. Variation of lower incisor inclination was larged. Condyle was displaced. 3) Changes from immediately before the release of intermaxillary fixation to the first month thereafter: Anterior-displacement of pogonion and antero-superior rotation of the proximal segment were found. Upper and lower incisors were inclined labially and lingually, respectively. Overjet was decreased. 4) Changes from the 1st to the 6th month after the release of intermaxillary fixation: Antero-superior rotation of the proximal segment and anterior displacement of pogonion were found to a slight extent. Upper incisor presented labial inclination and condyle tended to return to its preoperative position. The above results revealed that the aspect of relapse presented different changes between intermaxillary fixation period and after the release thereof. It was suggested to be ascribable to the setting up of the posterior margin of the distal segment in a position susceptible to the influence of soft tissues at skeletal fixation and to the extension of medial pterygoid muscle adherent to the distal segment. Therefore, appropriate retention of Class III elastics after the release there of were judged to be useful as countermeasures against relapse. In order to obtain postoperative stability, appropriate positioning of the proximal segment and countermeasures to the stress of medial pterygoid muscle during operation remain to be required further.

Female↗
PubMed1989

[Combined orthognathic surgery for fractures reduction, in mandibular prognathic patients].

Fractures of the facial skeleton require immediate reduction, in order to avoid functional and esthetic disorders. But in cases where the patient had already a facial deformity such as prognathism, a combination with sagittal splitting osteotomy operation is indicated, for reduction of the fracture and the deformity as well, in one stage. We present two such cases, with satisfactory results.

Adult↗
PubMed1977

The dog as an instruction model for surgical correction of mandibular prognathism.

Intraoral sagittal splitting of the mandible in dogs is an instructional exercise for correction of prognathism. The dog was selected as a surgical model for several reasons including the ability of this species to open the mouth widely. Comparative anatomical features of the mandibles of man and dog suggest that a sagittal splitting technique practiced in dogs may give expertise that would avoid complications, such as cutting vessels and nerves in humans. In addition, the dog should be carefully considered as a model for long-term study of surgical complications and of the effects of surgery on mandibular growth in young patients.

Animals↗
PubMedDate not supplied

[Comparative characteristics of masticatory muscle tonus in children with orthognathic and prognathic deep bites before and after orthodontic treatment].

In 99 orthognathic children 7 to 15 years and 83 age-matched children with deep prognathism the masticatory muscles stiffness was measured in a relatively resting state and maximal voluntary contraction. In children with anomalous occlusion the stiffness of relaxed muscles was increased as related to normal values, and their contractility was reduced. After the orthodontic treatment the indices of muscular tonus improved.

Adolescent↗
PubMed1989

Mandibular prognathism.

The use of the vertical subcondylar osteotomy for correction of uncomplicated mandibular prognathism is reviewed. Techniques for use in more complicated cases such as when a set back of greater than 10 mm is required are also described.

Humans↗
PubMed1988

The surgical correction of mandibular prognathism using rigid internal fixation--a report of a new technique together with its long-term stability.

A historical review of the literature for the surgical correction of mandibular prognathism is presented, together with a list of ideal conditions for the successful treatment of this condition. This is a report of a new surgical technique which satisfies the majority of these principles and demonstrates stability at the osteotomy site.

Bone Screws↗
PubMed1986

Stability of the mandible after sagittal ramus osteotomy for correction of prognathism.

The change in the position of the mandible after sagittal ramus osteotomy was evaluated on lateral cephalograms and in dental casts in 44 patients with mandibular prognathism. The postoperative relapse of the mandible at four landmarks was less than 1 mm on cephalograms and 1.1 mm at the first molar on the side with the larger posterior movement. The tendency to relapse was greater in cases in which large posterior and/or lateral movements of the mandible occurred at surgery. The importance of proper postoperative care and avoidance of lateral shift of the mandible to minimize relapse is stressed.

Adolescent↗
PubMed1981

[The psychological consequences of prognathism (author's transl)].

In a prospective study of 54 prognathic patients the psychological effects of this condition, which occurs typically at puberty, were investigated in postoperative follow-up examinations and the psychological effect of a corrective operation investigated. For this purpose standardized questionnaires and a semistructured psychiatric interview were used. The hypothetically expected personality disturbance of a "dysmorphophobia" was found in only some of our patients. With an inconspicuous premorbid personality they reacted to the psychological trauma of their facial deformity with depressive crises of self-assessment in the occupational and private spheres. Here, convincing postoperative improvements occur beside which the "psychological scars" are still recognizable owing to the earlier deformity.

Adult↗
PubMed1980

Skeletal and dental changes after surgical correction of mandibular prognathism.

Fifty cases of surgically corrected mandibular prognathism have been followed up and analyzed cephalometrically. This anatomy of relapse of the proximal and distal segments is described, as well as changes in the axial inclinations of the incisors. The physiopathology that may explain these spatial changes is advanced.

Adult↗